CN102136826A - ACL control and temperature compensation method and device - Google Patents
ACL control and temperature compensation method and device Download PDFInfo
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- CN102136826A CN102136826A CN2010105806410A CN201010580641A CN102136826A CN 102136826 A CN102136826 A CN 102136826A CN 2010105806410 A CN2010105806410 A CN 2010105806410A CN 201010580641 A CN201010580641 A CN 201010580641A CN 102136826 A CN102136826 A CN 102136826A
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Abstract
The invention discloses an ACL (access control list) control and temperature compensation method and device. The ACL control and temperature compensation method comprises the following steps: a radiofrequency signal enters a radiofrequency main channel, reaches a certain output point and enters a power coupling device so as to obtain a coupling signal; the coupling signal passes through a wave detector so as to obtain a wave detection signal; the wave detection signal is amplified by an amplifier and subjected to voltage limiting, and then sent to a digital processor; the digital processor obtains an analog signal relevant to the wave detection signal and temperature according to the amplified and voltage-limited wave detection signal and a temperature signal detected by a temperature detector; the analog signal relevant to the wave detection signal and temperature is amplified; and the amplified signal is sent to an analog attenuator, and the analog attenuator regulates the attenuation quantity. The ACL control and temperature compensation device has low cost and is arranged simply; the device has high accuracy when being used for controlling TD (time delay) signals of different time slots; the linear indexes of the radiofrequency signal such as EVM (error vector magnitude) and the like can not be deteriorated; and the linear control range of the radiofrequency signal is wider.
Description
Technical field
The present invention relates to radio-frequency technique field in the mobile communication system, relate in particular to a kind of ACL control and temperature compensation and device.
Background technology
In recent years, along with the Large scale construction of 3G network, in order to reduce equipment investment and operation cost, the raising of efficiency power amplifier more and more becomes the focus that operator pays close attention to.The key problem of power amplifier is linearisation and high efficiency, higher efficient not only can be saved the electricity charge for operator, can also save the investment of auxiliary facilities such as power supply, and because the simplification of production technology, reduced the requirement of complete machine heat radiation, the reliability of increase equipment makes network performance more stable.Therefore, digital pre-distortion (DPD) technology, envelope-tracking (Envelope tracking), Doherty technology, envelope are eliminated the technology that regeneration techniques (Envelope elimination restoration), peak value reduce raisings efficiency power amplifier such as technology (Crest factor reduction), adaptive-biased technology (adaptive bias), adaptive RF pre-distortion technology and linearity all development in various degree, at present, these technology have all obtained using widely in the high-efficient linear power amplification system.
In most of high-efficient linear power amplification systems and some particular devices, all need the radio frequency signal power is controlled, make the power invariability of certain node on the radio frequency path or system's output in certain scope, the signal power that satisfies system's output is the constant and requirement that keeps favorable linearity in certain temperature range.ALC unit and temperature compensation unit are one of Primary Components of whole wireless system, its functional requirement is according to the variation of the input power of certain node on the radio frequency path and the variation of ambient temperature, constantly regulate the pad value of certain node on the radio frequency path, make the power output of this node keep constant.If it can not keep the power output of this node to keep constant, so, the performance of whole system will be affected, communicating by letter and will be damaged between whole communication system and the system, even cause device damage to cause the communication paralysis.Such as the alc circuit that is applied to the high Linear Power Amplifier of high efficiency system, if it can not keep the power output of this node to keep constant, the power output of whole power amplification system just may be bigger than normal or less than normal and can not reach communicating requirement, and the linearity of power amplification system and efficiency index will be affected greatly, even cause power amplifier to burn and cause whole system destroyed.
Present ALC and temperature compensation unit circuit mainly contain following several:
First kind of mode, radiofrequency signal obtains coupled signal by coupler, and coupled signal is delivered to single-chip microcomputer through after the detection of wave detector.Single-chip microcomputer is exported serial or Parallel Digital control signal according to the detecting circuit of output.Numerical-control attenuator on the digital controlled signal control primary path is realized the purpose that ALC controls.Its principle such as accompanying drawing 1, this ALC control circuit is the power of control signal more accurately, but control precision is lower, can't realize the continuous control of minimal error, only can keep the power output of certain node to remain in the scope of certain error.When the high low temp compensating that adopts the temperature compensation attenuator to realize to gain, it only can carry out rough compensation to system gain, can't be implemented in each temperature spot continuously, compensation, and the cost height of thermo-compensator accurately.
The second way, radiofrequency signal obtains coupled signal by coupler, and coupled signal is delivered to high speed operation amplifier through after the detection of wave detector.Directly control analog attenuator through the signal after the processing such as amplification, thereby realize the purpose of automated power control.Its principle such as accompanying drawing 2.
This analog circuit is realized simple relatively, and when still being applied in the signal of control different time-gap different carrier number, ALC power has bigger difference.Facts have proved that this circuit is when the control time slot signal, ALC starts to control state deeply can cause linear index severe exacerbations such as EVM, even can't demodulation.Aspect the continuity of cost and temperature-compensating, also exist the same problem of first kind of mode.
Simultaneously, also there is the similar fashion of above two kinds of forms in the ALC control circuit, coupling detection form and handle the back in detection and add processing such as emitter follower for example, but it all can only carry out rough compensation to system gain, can't be implemented in each temperature spot continuously, compensation accurately.
The software compensation method and the improved radio-frequency module of a kind of RF module performance of Chinese invention patent (patent No. 200710123968), increase radio frequency power output testing circuit, module monitors circuit, low-power amplifier in existing radio-frequency module, changing original hardware compensating circuit simultaneously is the radio frequency numerical-control attenuator; Design radio-frequency module maximum gain is bigger than specified gain, exceeds part and adjusts as required by numerical-control attenuator; The software program that moves on the CPU in the wherein said module monitors circuit compensates form according to the default linearity of current environmental temperature inquiry that collects or calculates according to default formula/algorithm, the linearity offset data of inquiry gained or calculating gained is delivered to digital to analog converter and is changed into the grid voltage that magnitude of voltage is delivered to the power amplifier in the radio-frequency module internal power amplifying circuit, thereby play the effect of the control radio-frequency module linearity, reach and reduce the effect influenced by ambient temperature of the radio-frequency module linearity; The software program that moves on the CPU in the described module monitors circuit is inquired about default power back-off form according to the Current Temperatures that collects or is calculated according to default formula/algorithm, obtain or calculate the detected radio-frequency power value of offset data correction of gained with inquiry, reduce the effect influenced by ambient temperature of radio-frequency module power detection accuracy thereby reach; The software program that moves on the CPU in the described module monitors circuit is according to the radio frequency power output value and the radio-frequency (RF) input power value that collect, and the difference of radio frequency power output value and radio-frequency (RF) input power and the yield value that leaves in the program compared, adjust the radio-frequency module numerical-control attenuator according to result relatively, reduce radio-frequency module amplifying circuit gain effect influenced by ambient temperature thereby reach.This patent only is the temperature-compensating to gain, and what use is digital pad, is above-mentioned first kind of mode, can not realize high-precision continuous ALC control and gain compensation.
Summary of the invention
The objective of the invention is to provides a kind of ACL control and temperature compensation and device at the deficiencies in the prior art; When it controls the TD signal of different time-gap, the accuracy height, the while can be realized the intelligent Continuous Compensation of temperature, gain compensation and power control are very accurate.
Purpose of the present invention realizes by following technical measures: a kind of ACL control and temperature compensation comprise the steps:
A: radiofrequency signal enters the radio frequency primary path, arrives output point, and the ingoing power coupling device obtains coupled signal;
B: coupled signal obtains rectified signal through behind the detector arrangement;
C: after amplifier amplification of rectified signal process and pressure limiting are handled, deliver to digital processing unit;
D: digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling, and obtains an analog signal with rectified signal and temperature correlation;
E: the rectified signal that obtains among the step D and the analog signal of temperature correlation are carried out processing and amplifying;
F: deliver to analog attenuator through amplified analog signal in the step e, analog attenuator is adjusted attenuation.
Wherein, step D is specifically:
D1: the detected temperature signal process of temperature-detecting device analog-to-digital conversion obtains the M signal with temperature correlation, handles the acquisition temperature offset amount with the M signal process of temperature correlation; Rectified signal after process amplification that step C obtains and pressure limiting are handled is through obtaining the digital signal relevant with detection after the analog-to-digital conversion;
D2: the temperature offset amount M signal relevant with rectified signal that obtains among the step D1 merged processing, the digital signal of acquisition and rectified signal and temperature correlation;
D3: with the digital signal of rectified signal and temperature correlation analog signal through acquisition after the digital-to-analogue conversion and rectified signal and temperature correlation.
Wherein, the concrete grammar of analog attenuator adjustment attenuation is in the step F:
The process amplified analog signal is through behind flow restricter, shunt and the radio frequency network in the step e, deliver to the little band backbone that is connected with attenuator tube, little band backbone is communicated with the radio frequency primary path by capacitance, radio frequency time delay network, the current signal of process detection amplified current signal and radio frequency primary path is with synchronous at the attenuator tube place, the attenuator tube negative pole is parallel with radio-frequency-short device and direct-current short circuit device, direct-current short circuit device ground connection, analog passband signal overdamping pipe, after entering the radio-frequency-short device, disperse consumption, thereby play the attenuation effect of adjusting.
Wherein, coupled signal resists the resistance coupling before the step B, and rectified signal resists the resistance coupling before the step C.
Wherein, rectified signal passes through emitter follower before the step C.
Wherein, described " obtaining temperature offset amount through handling with the M signal of temperature correlation " is specially, and " obtains temperature offset amount with the M signal process lookup table algorithm processing of temperature correlation;
Described " digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment " is specially " digital signal that detection is relevant is handled the back through lookup table algorithm and obtained the M signal relevant with rectified signal ".
Wherein, the power coupling device comprises 3dB electric bridge, power splitter, coupler.
A kind of ACL control and temperature compensation means comprise power coupling device, detector arrangement, amplifier, digital processing unit, analog attenuator, temperature-detecting device;
Radiofrequency signal enters the radio frequency primary path, arrives output point, and the ingoing power coupling device obtains coupled signal;
Coupled signal obtains rectified signal through behind the detector arrangement; After amplifier amplification of rectified signal process and pressure limiting are handled, deliver to digital processing unit; Digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling, and obtains an analog signal with rectified signal and temperature correlation; The analog signal of rectified signal and temperature correlation is delivered to analog attenuator through processing and amplifying, and analog attenuator is adjusted attenuation.
Wherein, analog attenuator comprises flow restricter, shunt, attenuator, capacitance, direct-current short circuit device;
Digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling, obtaining the concrete grammar with the analog signal of rectified signal and temperature correlation is: at first the detected temperature signal of temperature-detecting device is through the M signal of analog-to-digital conversion acquisition with temperature correlation, obtain temperature offset amount with the M signal of temperature correlation through handling, through obtaining the digital signal relevant with detection after the analog-to-digital conversion, the digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment through the rectified signal after amplifier and the pressure limiting processing; Then that temperature offset amount is relevant with rectified signal M signal merges handles the digital signal of acquisition and rectified signal and temperature correlation; Last digital signal with rectified signal and temperature correlation is passed through the analog signal of acquisition and rectified signal and temperature correlation after the digital-to-analogue conversion;
The concrete grammar that analog attenuator is adjusted attenuation is: through amplified analog signal process flow restricter, shunt, and behind the radio frequency network, deliver to the little band backbone that is connected with attenuator tube, little band backbone passes through capacitance, the radio frequency time delay network is communicated with the radio frequency primary path, the current signal of process detection amplified current signal and radio frequency primary path is with synchronous at the attenuator tube place, the attenuator tube negative pole is parallel with radio-frequency-short device and direct-current short circuit device, direct-current short circuit device ground connection, analog passband signal overdamping pipe, after entering the radio-frequency-short device, disperse consumption, thereby play the attenuation effect of adjusting.
Wherein, coupled signal resists the resistance coupling through before the detector arrangement through match circuit; Coupled signal through before the amplifier, resists the resistance coupling through match circuit through behind the detector arrangement earlier, enters emitter follower.
Described " obtaining temperature offset amount through handling with the M signal of temperature correlation " is specially, and " obtains temperature offset amount with the M signal process lookup table algorithm processing of temperature correlation;
Described " digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment " is specially " digital signal that detection is relevant is handled the back through lookup table algorithm and obtained the M signal relevant with rectified signal ";
The power coupling device comprises 3dB electric bridge, power splitter, coupler.
Beneficial effect of the present invention is: a kind of ACL control and temperature compensation, realize by the following method, at first radiofrequency signal enters the radio frequency primary path and arrives output point, the ingoing power coupling device obtains coupled signal, coupled signal obtains rectified signal through behind the detector arrangement, after amplifier amplification of rectified signal process and pressure limiting are handled, deliver to digital processing unit; Digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling then, obtain an analog signal with rectified signal and temperature correlation, at last the analog signal of rectified signal and temperature correlation is carried out processing and amplifying; Deliver to analog attenuator through amplified analog signal, analog attenuator is adjusted attenuation, thereby has realized ALC control and temperature-compensating.When the present invention controls the TD signal of different time-gap, the accuracy height, the while can be realized the intelligent Continuous Compensation of temperature, gain compensation and power control are very accurate.
Description of drawings
Fig. 1 is first kind of situation schematic diagram of prior art of the present invention;
Fig. 2 is second kind of situation schematic diagram of prior art of the present invention;
Fig. 3 is a schematic diagram of the present invention;
Fig. 4 is a software control FB(flow block) in the digital processing unit of the present invention;
Fig. 5 is an analog attenuator control structure schematic diagram of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing, as Fig. 3 ~ shown in Figure 5.
Embodiment 1
A kind of ACL control and the temperature compensation of present embodiment, realize by the following method, at first radiofrequency signal enters the radio frequency primary path and arrives certain output point, the ingoing power coupling device obtains coupled signal, coupled signal obtains rectified signal through behind the detector arrangement, after amplifier amplification of rectified signal process and pressure limiting are handled, deliver to digital processing unit; Rectified signal and the detected temperature signal of temperature-detecting device after digital processing unit is handled according to amplification, pressure limiting then, obtain an analog signal with rectified signal and temperature correlation, at last the analog signal of rectified signal and temperature correlation is carried out processing and amplifying; Deliver to analog attenuator through the signal after amplifying, analog attenuator is adjusted attenuation, thereby has realized ALC control and temperature-compensating.Cost of the present invention is low, layout is simple; During the TD signal of control different time-gap, the accuracy height, and the linear indexes such as EVM of radiofrequency signal can not worsen, and the linear control range of radiofrequency signal is higher; Realize the intelligent Continuous Compensation of temperature simultaneously, gain compensation and power control are very accurate.
The present embodiment coupled signal enters before the detector arrangement and further resists the resistance coupling afterwards.
The present embodiment coupled signal passes through emitter follower earlier after entering detector arrangement, reduces the influence of one step of back operational amplifier to the detection tube impedance matching.
The power coupling device of present embodiment comprises 3dB electric bridge, power splitter or coupler.
The model of the operational amplifier of present embodiment can be OPA2690.
Embodiment 2
As shown in Figure 4, rectified signal and the detected temperature signal of temperature-detecting device after the digital processing unit of present embodiment is handled according to amplification, pressure limiting, obtaining the concrete grammar with the analog signal of rectified signal and temperature correlation is: at first the detected temperature signal of temperature-detecting device obtains M signal with temperature correlation through analog-to-digital conversion, obtains temperature offset amount with the M signal of temperature correlation through handling; Through obtaining the digital signal relevant with detection after the analog-to-digital conversion, the digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment through the rectified signal after amplification and the pressure limiting processing; Then, the M signal that temperature offset amount is relevant with rectified signal merges processing, the digital signal of acquisition and rectified signal and temperature correlation; At last, with the digital signal of rectified signal and temperature correlation analog signal through acquisition after the digital-to-analogue conversion and rectified signal and temperature correlation.
Described " obtaining temperature offset amount through handling with the M signal of temperature correlation " of present embodiment is specially, and " obtains temperature offset amount with M signal process lookup table algorithm (LUT algorithm) processing of temperature correlation; Described " digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment " is specially " digital signal that detection is relevant is handled the back through lookup table algorithm (LUT algorithm) and obtained the M signal relevant with rectified signal ", because the signal of different systems, the voltage signal difference that obtains after the detection, for control signal power more accurately, this need adopt different algorithms to realize, the lookup table algorithm of present embodiment (LUT algorithm) is exactly wherein a kind of.Also can adopt different average algorithms to reduce sampling error.
The realization principle of comprehensive above-mentioned example is:
As shown in Figure 3, behind the radiofrequency signal of different systems different frequency ranges such as WCDMA, CDMA, TD-SCDMA, the WLAN process J1 input; Arrive certain output point by the radio frequency primary path, the ingoing power coupling device.The power coupling device can be 3dB electric bridge, power splitter, coupler etc.; Power coupling device output coupled signal is by the envelope signal of detector arrangement extraction radiofrequency signal; All need before and after the detector arrangement to add necessary match circuit, reach impedance matching effect; Envelope signal is the voltage signal relevant with input power, and after processing such as operational amplifier, signal obtains amplitude and amplifies.Before entering amplifier, by emitter follower, reduce the influence of amplifier earlier to the detection tube impedance matching; Envelope signal after the amplification through processing such as amplitude limit, filtering, is reasonably controlled the voltage of envelope signal; Obtain voltage-controlled rectified signal and deliver to digital processing units such as MCU, FPGA.The simultaneous temperature checkout gear will produce a temperature variant voltage according to the temperature of equipment at that time; Temperature variant voltage is also delivered to digital processing units such as single-chip microcomputer.
Present embodiment is in digital processing unit, the voltage signal of variations in temperature and obtain voltage-controlled rectified signal, carry out the AD conversion, convert digital signal to, carry out analysis-by-synthesis and algorithm computation then, obtain a voltage signal with detection power and temperature correlation, algorithm herein can be lookup table algorithm (a LUT algorithm), also can be the SQL method.
After voltage signal present embodiment and detection power and temperature correlation is changed through DA, by processing such as amplification, filtering, deliver to the controllable simulation attenuator, analog attenuator changes the decay amount, thereby realize ALC control and the integrated processing of temperature-compensating, DA conversion of the present invention and AD conversion can be finished in digital processing unit also and can realize conversion at peripheral circuit.
Embodiment 3
As shown in Figure 5, the analog attenuator of present embodiment is adjusted attenuation, thereby realizes that the specific implementation method that ALC accurately controls is:
F1: through the continuous current signal of the signal controlled decay after amplifying after amplifying;
F2: the continuous current signal of control decay is regulated through flow restricter, shunt, radio-frequency-short device;
F3: the electric current that step F 2 obtains is delivered to the little band backbone that is connected with attenuator tube, n=0,2,3 by behind 2n+1 (1/4) wavelength line ... t;
F4: the electric current that step F 3 obtains arrives the radio-frequency-short device at microstrip line 2n+1 (1/4) the wavelength place of primary path, and by radio-frequency-short device and 2n+1 (1/4) wavelength line acting in conjunction, the relative radio frequency primary path of the current path after the current limliting is considered as open circuit;
F5: electric current that step F 4 is obtained and radio frequency primary path power on to fail to be convened for lack of a quorum and close, and at distance dc capacitor 2n+1 (1/4) wavelength place, place attenuator tube, and the electric current that the electric current of feasible process radio frequency primary path and step F 4 are obtained is synchronous at the attenuator tube place;
F6: the negative pole of step F 5 described attenuator tubes and running fire be short-circuiting device and direct-current short circuit device frequently;
F7: the current signal after the current limliting is connected to ground by behind the step F 5 described attenuator tubes by the direct-current short circuit device;
F8: after step F 7 processing, attenuator tube is in certain conducting state, and the part radiofrequency signal will be dispersed consumption by the radio-frequency-short device by behind the attenuator tube like this;
F9: to step 8 process, increase the control range of ALC by repeating step 5;
F10:, become the state of power invariability by the signal continuous control of digital processing device output through the radiofrequency signal after the step 9;
F11: at the path two ends of placing attenuator tube, increase capacitance, guarantee that the input and output side of analog attenuator can not influence the direct current biasing state of attenuator tube;
F12: when temperature-detecting device detected the change of temperature information, corresponding change was input to the signal value of analog attenuator;
F13: the signal value that is input to analog attenuator must change, and makes that equally the attenuation under the analog attenuator ALC state obtains corresponding change;
F14: in the step F 13, the amount of the corresponding change of attenuation under the analog attenuator ALC state is consistent with the deviation of ALC performance number under this temperature with reference value.
The gain temperature compensation function of the analog attenuator in the middle of the present invention realizes that principle is as follows:
By above-mentioned analog attenuation apparatus ALC function by the agency of, when power output does not reach the ALC maximum power state, the certain attenuation of signal retentive control analog attenuator of digital processing device output;
Temperature-detecting device is passed to the digital processing device after temperature information is changed through AD;
The digital processing device adopts lookup table algorithm (LUT algorithm) or other penalty function algorithms to regulate the signal that outputs to analog attenuator according to temperature information;
The attenuation of the corresponding change analog attenuator of signal after treatment; The attenuation of analog attenuator changes corresponding with the variation of link gain under this temperature and fiducial value; Thereby reach the gain temperature compensation function.
Temperature-compensating of the present invention is with under the normal temperature, and the gain of modular design is a foundation, and certain temperature value when temperature detection obtains by the module change in gain amount under this temperature that sets in advance, obtains the change in gain of this module reality under this temperature value.In order to make whole module gain under each temperature, keep constant, so in digital processing unit, with what introduce above, the signal that processing obtains compensates skew, after processing and amplifying, to attenuator, thereby change the attenuation of attenuator, thereby realized temperature compensation function.
Embodiment 4
A kind of ACL control and temperature compensation means comprise power coupling device, detector arrangement, amplifier, digital processing unit, analog attenuator, temperature-detecting device;
Radiofrequency signal enters the radio frequency primary path and arrives certain output point, and the ingoing power coupling device obtains coupled signal;
Coupled signal obtains rectified signal through behind the detector arrangement; After amplifier amplification of rectified signal process and pressure limiting are handled, deliver to digital processing unit; Digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling, and obtains an analog signal with rectified signal and temperature correlation; The analog signal of rectified signal and temperature correlation is delivered to analog attenuator through processing and amplifying, and analog attenuator is adjusted attenuation.
The digital processing unit of present embodiment is according to amplification, rectified signal and the detected temperature signal of temperature-detecting device after pressure limiting is handled, obtaining the concrete grammar with the analog signal of rectified signal and temperature correlation is: at first the detected temperature signal of temperature-detecting device is through the M signal of analog-to-digital conversion acquisition with temperature correlation, handle the acquisition temperature offset amount with the M signal of temperature correlation through lookup table algorithm (LUT algorithm), through obtaining the digital signal relevant with detection after the analog-to-digital conversion, the digital signal that detection is relevant obtains the M signal relevant with rectified signal through lookup table algorithm (LUT algorithm) processing back through the rectified signal after amplifier and the pressure limiting processing; Then that temperature offset amount is relevant with rectified signal M signal merges handles the digital signal of acquisition and rectified signal and temperature correlation; Last digital signal with rectified signal and temperature correlation is passed through the analog signal of acquisition and rectified signal and temperature correlation after the digital-to-analogue conversion; Analog attenuator comprises flow restricter, shunt, attenuator, capacitance, direct-current short circuit device; The concrete grammar that analog attenuator is adjusted attenuation is: through amplified analog signal process flow restricter, shunt, and behind the radio frequency network, deliver to the little band backbone that is connected with attenuator tube, little band backbone passes through capacitance, the radio frequency time delay network is communicated with the radio frequency primary path, the current signal of process detection amplified current signal and radio frequency primary path is with synchronous at the attenuator tube place, the attenuator tube negative pole is parallel with radio-frequency-short device and direct-current short circuit device, direct-current short circuit device ground connection, analog passband signal overdamping pipe, after entering the radio-frequency-short device, disperse consumption, thereby play the attenuation effect of adjusting.
The coupled signal of present embodiment resists the resistance coupling through before the detector arrangement through match circuit; Coupled signal through before the amplifier, resists the resistance coupling through match circuit through behind the detector arrangement earlier, enters emitter follower.
The power coupling device of present embodiment comprises 3dB electric bridge, power splitter or coupler.
In order to guarantee the little time-delay of trying one's best, the processing speed of operational amplifier of the present invention will be as quickly as possible, and the model of operational amplifier can be OPA2690.
According to the difference of the signaling mode of being controlled, the algorithm of digital processing and the mode of temperature-compensating are suitable, make that the control implementation is just right.
The present invention compares with temp compensation method with existing digital ALC control circuit, has solved shortcomings such as control precision is poor, cost height; Compare with the temperature compensation mode with existing simulation ALC control, optimized under the control different time-gap situation, control precision is poor, and EVM worsens rapidly, even problem that can't demodulation.
Experimental results show that, the present invention can be under situation about dropping into cheaply, adopt simple layout, realize very high dynamic ALC control, and when the TD signal of control different time-gap, the accuracy height, and the linear indexes such as EVM of radiofrequency signal can not worsen, and have kept the higher range of linearity control of radiofrequency signal.Simultaneously, the integrated combination of temperature-compensation circuit, realized the intelligent Continuous Compensation of temperature, when having reduced cost, can't overlap with system's temperature compensation curve and cause the problem of temperature compensation low precision to realize gain compensation and power control very accurately thereby solved present temperature compensation resistance, make equipment performance be greatly improved.
Therefore, this ALC control of the present invention and temperature-compensating integrated circuit need in the communication equipment of automatic control of ALC and temperature-compensating at all, particularly require the control precision height, the temperature-compensating error is little and ALC linearity and flatness are had in the communication system of suitable high request, and good prospects for application can be arranged.
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although the present invention has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the essence and the scope of technical solution of the present invention.
Claims (10)
1. an ACL controls and temperature compensation, it is characterized in that, comprises the steps:
A: radiofrequency signal enters the radio frequency primary path, arrives output point, and the ingoing power coupling device obtains coupled signal;
B: coupled signal obtains rectified signal through behind the detector arrangement;
C: after amplifier amplification of rectified signal process and pressure limiting are handled, deliver to digital processing unit;
D: digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling, and obtains an analog signal with rectified signal and temperature correlation;
E: the rectified signal that obtains among the step D and the analog signal of temperature correlation are carried out processing and amplifying;
F: deliver to analog attenuator through amplified analog signal in the step e, analog attenuator is adjusted attenuation.
2. a kind of ACL control according to claim 1 and temperature compensation is characterized in that: step D specifically:
D1: the detected temperature signal process of temperature-detecting device analog-to-digital conversion obtains the M signal with temperature correlation, handles the acquisition temperature offset amount with the M signal process of temperature correlation; Rectified signal after process amplification that step C obtains and pressure limiting are handled is through obtaining the digital signal relevant with detection after the analog-to-digital conversion;
D2: the temperature offset amount M signal relevant with rectified signal that obtains among the step D1 merged processing, the digital signal of acquisition and rectified signal and temperature correlation;
D3: with the digital signal of rectified signal and temperature correlation analog signal through acquisition after the digital-to-analogue conversion and rectified signal and temperature correlation.
3. a kind of ACL control according to claim 2 and temperature compensation is characterized in that: the concrete grammar of analog attenuator adjustment attenuation is in the step F:
The process amplified analog signal is through behind flow restricter, shunt and the radio frequency network in the step e, deliver to the little band backbone that is connected with attenuator tube, little band backbone is communicated with the radio frequency primary path by capacitance, radio frequency time delay network, the current signal of process detection amplified current signal and radio frequency primary path is with synchronous at the attenuator tube place, the attenuator tube negative pole is parallel with radio-frequency-short device and direct-current short circuit device, direct-current short circuit device ground connection, analog passband signal overdamping pipe, after entering the radio-frequency-short device, disperse consumption, thereby play the attenuation effect of adjusting.
4. a kind of ACL control according to claim 1 and temperature compensation, it is characterized in that: coupled signal resists the resistance coupling before the step B, and rectified signal resists the resistance coupling before the step C.
5. a kind of ACL control according to claim 1 and temperature compensation, it is characterized in that: rectified signal passes through emitter follower before the step C.
6. a kind of ACL control according to claim 2 and temperature compensation, it is characterized in that: described " obtaining temperature offset amount through handling " with the M signal of temperature correlation, be specially, " handle the acquisition temperature offset amount with the M signal of temperature correlation through lookup table algorithm;
Described " digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment " is specially " digital signal that detection is relevant is handled the back through lookup table algorithm and obtained the M signal relevant with rectified signal ".
7. according to any described a kind of ACL control of claim 1-6 and temperature compensation, it is characterized in that: the power coupling device comprises 3dB electric bridge, power splitter, coupler.
8. an ACL controls and temperature compensation means, it is characterized in that: comprise power coupling device, detector arrangement, amplifier, digital processing unit, analog attenuator, temperature-detecting device;
Radiofrequency signal enters the radio frequency primary path, arrives output point, and the ingoing power coupling device obtains coupled signal;
Coupled signal obtains rectified signal through behind the detector arrangement; After amplifier amplification of rectified signal process and pressure limiting are handled, deliver to digital processing unit; Digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling, and obtains an analog signal with rectified signal and temperature correlation; The analog signal of rectified signal and temperature correlation is delivered to analog attenuator through processing and amplifying, and analog attenuator is adjusted attenuation.
9. a kind of ACL control according to claim 8 and temperature compensation means is characterized in that:
Analog attenuator comprises flow restricter, shunt, attenuator, capacitance, direct-current short circuit device;
Digital processing unit is according to amplifying and rectified signal and the temperature-detecting device detected temperature signal of pressure limiting after handling, obtaining the concrete grammar with the analog signal of rectified signal and temperature correlation is: at first the detected temperature signal of temperature-detecting device is through the M signal of analog-to-digital conversion acquisition with temperature correlation, obtain temperature offset amount with the M signal of temperature correlation through handling, through obtaining the digital signal relevant with detection after the analog-to-digital conversion, the digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment through the rectified signal after amplifier and the pressure limiting processing; Then that temperature offset amount is relevant with rectified signal M signal merges handles the digital signal of acquisition and rectified signal and temperature correlation; Last digital signal with rectified signal and temperature correlation is passed through the analog signal of acquisition and rectified signal and temperature correlation after the digital-to-analogue conversion;
The concrete grammar that analog attenuator is adjusted attenuation is: through amplified analog signal process flow restricter, shunt, and behind the radio frequency network, deliver to the little band backbone that is connected with attenuator tube, little band backbone passes through capacitance, the radio frequency time delay network is communicated with the radio frequency primary path, the current signal of process detection amplified current signal and radio frequency primary path is with synchronous at the attenuator tube place, the attenuator tube negative pole is parallel with radio-frequency-short device and direct-current short circuit device, direct-current short circuit device ground connection, analog passband signal overdamping pipe, after entering the radio-frequency-short device, disperse consumption, thereby play the attenuation effect of adjusting.
10. a kind of ACL control according to claim 9 and temperature compensation means is characterized in that:
Coupled signal resists the resistance coupling through before the detector arrangement through match circuit; Coupled signal through before the amplifier, resists the resistance coupling through match circuit through behind the detector arrangement earlier, enters emitter follower,
Described " obtaining temperature offset amount through handling with the M signal of temperature correlation " is specially, and " obtains temperature offset amount with the M signal process lookup table algorithm processing of temperature correlation;
Described " digital signal that detection is relevant obtains the M signal relevant with rectified signal after treatment " is specially " digital signal that detection is relevant is handled the back through lookup table algorithm and obtained the M signal relevant with rectified signal ";
The power coupling device comprises 3dB electric bridge, power splitter, coupler.
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